Mainly it's that the characters each only have one note. Victoria is fanatical. Ostergaard is angry. Kamea heroically suffers for her people. Alexander is loyal. This feels deliberate, and is what I mean about bad decisions made about the direction of the story. Just because it's a sci-fi video game it doesn't mean the audience can't handle it.
It's . . . harder than that, I mean there's other notes involved in the songs of their lives. But these notes do come out so strong it's like Geddy Lee's voice - you really get sucked in by one thing, often, and don't notice the rest.
Kamea heroically suffers for her people, but she is pushing this war too fast, she is overextending, she wants to finish it quickly and winds up paying for the lack of planning. She isn't comfortable doing this, but she knows it must be done and the longer the war goes on the more she is willing to sacrifice to get to Coromodir with the Founding Houses behind her.
Ostengaard is angry, but he's a man who has nothing left now other than that anger. He is a bitter shell of a man ruined and lashing out, because there is nothing left for him without his pride and joy. Sadly, he is underdeveloped and we don't get a chance to see what's going on here; this is for the best, as it would VASTLY distract from our current predicament.
Victoria is fanatical, or rather she is as loyal as Alexander and just on the wrong side. She is a berserker on the field of battle because she cannot allow herself to lose. She is chasing the sunk cost fallacy, and she deep down knows it. All that keeps her going is the belief it must mean something.